package cn.tedu.v3;

import java.io.*;
import java.net.BindException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 * Version 3   升级    双向互联【客户端与服务器端相互说话】
 *
 * 优化空间：代码结构、流没有关闭
 */

public class Server {
    private ServerSocket serverSocket;
    public Server() {
        try {
            serverSocket=new ServerSocket(4545);
        } catch (BindException e) {
            System.out.println("端口号重复申请，建议换个端口号");
        }catch (IOException e){
            System.out.println("申请端口号失败---");
        }
    }
    public void start(){
        try {
            while (true) {
                System.out.println("-----等待客户端链接-----");
                Socket socket = serverSocket.accept();
                String ip = socket.getInetAddress().getHostAddress();
                System.out.println(ip + "链接成功了");

                new Thread(new CS(socket)).start();
            }
        } catch (IOException e) {
            System.out.println("服务器端通讯断开了");
        } finally {
            if (serverSocket!=null&&!serverSocket.isClosed()){
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    System.out.println("服务器关闭失败");
                }
            }

        }
    }
    public static void main(String[] args){
        new Server().start();
    }
    private class CS implements Runnable{
        private Socket socket;
        private String ip;

        public CS(Socket s){
            this.socket=s;
            ip=socket.getInetAddress().getHostAddress();
        }
        public void run() {
//            BufferedReader br=null;
            PrintWriter pw=null;

            try {
                //1.读入定义
               BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream(), "UTF8"));
               //2.定义写出
                pw=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),"UTF8")),true);

                //1.1读入功能：存线程中
                new Thread(()->{
                    try {
                        String message;
                        while ((message=br.readLine())!=null){
                            System.out.println("客户端说："+message);
                            //增加写出一句话：读完卡住等待输入
                            System.out.println("服务端请输入:");
                        }
                    } catch (IOException e) {
                        System.out.println("客户端读入失败");
                    }
                }).start();

                //2.1提供写的方法：控制台输入
                Scanner input=new Scanner(System.in);//控制台卡住
            while (true) {
//                System.out.println("服务器请输入：");
                String say=input.nextLine();//得到控制台输入值
                //打印：服务器端说的文本---打印客户端
                pw.println(say);
            }
            }catch (NullPointerException e){
                System.out.println("IO流传入对象，有对象可能为null，立马核对，建议：查看try块中对象可能赋值为null");
            } catch (UnsupportedEncodingException e) {
                System.out.println("你的客户端或者服务器端字符集不一致");
            } catch (IOException e) {
                System.out.println("通讯过程中，传输错误！");
            } finally {
//                if(br!=null);
//                try {
//                    br.close();
//                } catch (IOException e) {
//                    System.out.println("结束通讯：关闭失败：");
//                }
                if (socket!=null&&socket.isClosed())
                    try {
                        socket.close();
                    } catch (IOException e) {
                        System.out.println("通讯关闭失败");
                    }
            }
        }
    }
}
